Development of dual-polarization reflectometry facility for Uragan-2M torsatron


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The dual-polarization reflectometry facility developed for torsatron U-2M uses the extraordinary wave in addition to the ordinary wave. This is possible because the magnetic field of U-2M is produced by external conductors, is independent of plasma parameters, and is therefore a known quantity. The plasma probing is carried out simultaneously in a large number of pairs of close frequencies, which makes it possible to use superheterodyne circuits and, hence, considerably improves noise protection of the system and accuracy of measurement of phase shifts. The use of the extraordinary wave considerably broadens the range of the densities being measured in the given frequency band of generators. To reconstruct the density profile of the plasma from the frequency dependence of the phase shift of probing waves, original iterative algorithms have been developed for solving integral equations that are stable to experimental errors.

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D. Grekov

Institute of Plasma Physics, National Research Center Kharkov

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Email: grekov@ipp.kharkov.ua
乌克兰, ul. Akademicheskaya 1, Kharkov, 61108

K. Tretiak

Institute of Plasma Physics, National Research Center Kharkov

Email: grekov@ipp.kharkov.ua
乌克兰, ul. Akademicheskaya 1, Kharkov, 61108

V. Filippov

Institute of Plasma Physics, National Research Center Kharkov

Email: grekov@ipp.kharkov.ua
乌克兰, ul. Akademicheskaya 1, Kharkov, 61108

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